67,512
社区成员
发帖
与我相关
我的任务
分享
@Entity
@Table(name="PRODUCT")
public class Product {
@Id @GeneratedValue
@Column(name="PRODUCT_ID")
private long id;
@Column(name="PRODUCT_NAME", nullable=false)
private String name;
public Product() {}
public long getId() {
return id;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
@Entity
@Table(name = "PUT_PRODUCT")
public class PutProduct {
@Id
@GeneratedValue
@Column(name = "PUT_PRODUCT_ID")
private long id;
@ManyToOne
@JoinColumn(name="PRODUCT_ID")
private Product product;
public PutProduct() {
}
public long getId() {
return id;
}
public void setProduct(Product product) {
this.product = product;
}
public Product getProduct() {
return product;
}
}
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
@Entity
public class OrderItem {
private Integer id;
private String productName;
private Float sellPrice = 0f;
private Order order;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@Column(length = 40, nullable = false)
public String getProductName() {
return productName;
}
public void setProductName(String productName) {
this.productName = productName;
}
@Column(nullable = false)
public Float getSellPrice() {
return sellPrice;
}
public void setSellPrice(Float sellPrice) {
this.sellPrice = sellPrice;
}
/*
* <manytoone column>
*/
@ManyToOne(cascade = { CascadeType.MERGE, CascadeType.REFRESH }, fetch = FetchType.EAGER, optional = false)
@JoinColumn(name="order_id")//指定列
public Order getOrder() {
return order;
}
public void setOrder(Order order) {
this.order = order;
}
}
import java.util.HashSet;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
@Entity
@Table(name="orders")
public class Order {
private String orderId;
private Float amount = 0f;
private Set<OrderItem> items = new HashSet<OrderItem>();
@Id
@Column(length = 12)
public String getOrderId() {
return orderId;
}
public void setOrderId(String orderId) {
this.orderId = orderId;
}
@Column(nullable = false)
public Float getAmount() {
return amount;
}
public void setAmount(Float amount) {
this.amount = amount;
}
@OneToMany(cascade = { CascadeType.REFRESH, CascadeType.PERSIST,
CascadeType.MERGE, CascadeType.REMOVE }, fetch = FetchType.LAZY, mappedBy = "order")
public Set<OrderItem> getItems() {
return items;
}
public void setItems(Set<OrderItem> items) {
this.items = items;
}
public void addOrderItem(OrderItem orderItem){
orderItem.setOrder(this);
this.items.add(orderItem);
}
}